You may choose to have the arbitration conducted by telephone, based on written submissions, or in person in the county where you live or at another mutually agreed location
While I try to avoid giving ridiculously low offers in an actual negotiation (just putting an offer out there knowing that you'll walk if it's rejected is not negotiating), it's always best to aim a little bit under the price you are will to pay to give yourself some room to up the offer
As for the upcoming Chaos Rising, TCGPlayer has a lot of listings at the moment
Related #4: Assaultron Invader/Walking Ballista While Walking Ballistas cost may seem prohibitive at first, it quickly becomes apparent that this cards value isnt in dumping a bunch of mana straight away, but increasing what youve got once its on the field
1 Guardians Rising Guardians Rising is likely the very best of the Sun & Moon era, even challenging Forbidden Light in terms of sheer quality